| 901 | NBTC | NEW BERN TRANSPORT CORPORATION | | | SCAC4 |
| 902 | NBTD | NOEL BROS TRUCKING | | | SCAC3 |
| 903 | NBTD | NTS TRANSPORTATION INC | | | SCAC4 |
| 904 | NBTF | N B T TRANSPORT INC | | | SCAC3 |
| 905 | NBTF | NORTH-BOUND TRANSPORTATION | | | SCAC4 |
| 906 | NBTH | NICOLS BROS TRUCKING INC | | | SCAC4 |
| 907 | NBTI | NOBLE TRANSPORT INC | | | SCAC3 |
| 908 | NBTI | NORSEBOAT LIMITED | | | SCAC4 |
| 909 | NBTJ | NEELON BROS TRUCKING LLC | | | SCAC4 |
| 910 | NBTL | N & B TRUCKING LLC | | | SCAC4 |
| 911 | NBTR | NEW BRUNSWICK TRANSFER | | | SCAC3 |
| 912 | NBTS | NOBLER TRANSPORTATION SERVICE | | | SCAC3 |
| 913 | NBTS | N B T TOURS | | | SCAC4 |
| 914 | NBTT | NORBET TRUCKING CORP | | | SCAC3 |
| 915 | NBTT | NORBET TRUCKING CORP | | | SCAC4 |
| 916 | NBTU | NISSAN BUTSURYU CO LTD | | J | BIC |
| 917 | NBTU | NISSAN BUTSURYU CO LTD | | | SCAC4 |
| 918 | NBTY | NO BS TRUCKING INC | | | SCAC4 |
| 919 | NBUT | NABU TRADING LLC | | | SCAC4 |
| 920 | NBVJ | Nora Bergslags Veteran-Jernväg | | SE | VKM |
| 921 | NBWE | NEIBAUR, WARREN EQUIPMENT INC | | | SCAC3 |
| 922 | NBWN | NAKASE BROTHERS WHOLESALE NURSERY | | | SCAC4 |
| 923 | NBWR | N B WREATHS | | | SCAC4 |
| 924 | NBXP | NORTH BEND EXPRESS | | | SCAC3 |
| 925 | NBXS | NORTHBOUND EXPRESS | | | SCAC4 |
| 926 | NBYT | NORTHERN BAY TRUCKING CO | | | SCAC3 |
| 927 | NBYU | NINGBO OCEAN SHIPPING CO,LTD | | PRC | BIC |
| 928 | NBZ | NATIONAL BY-PRODUCTS | | | PWRC |
| 929 | NC | National Jet Systems Pty. Ltd. | ICAO: NJS, Callsign: National Jet, Name changed to National Jet Systems Pty. Ltd. t/a Cobham Aviation Services Australia - Airline Services w.e.f. 13 May 2009. Designator NC reinstated by IATA | AUS | AVCODES |
| 930 | NC | Northern Air Cargo, Inc. | ICAO: NAC, Callsign: Yukon, IATA Prefix: 345, ICAO callsign changed from Northern Air Cargo. Name changed to Northern Air Cargo, LLC. | USA | AVCODES |
| 931 | NC | Northern Air Cargo, Inc. | ICAO: NAC, Callsign: Northern Air Cargo, IATA Prefix: 345, ICAO callsign changed to Yukon | USA | AVCODES |
| 932 | NC | North Central Airlines, Inc. | Callsign: North Central, | USA | AVCODES |
| 933 | NC | Nippon Cargo Airlines | ICAO: NCA, Callsign: Nippon Cargo, IATA designator changed to KZ | J | AVCODES |
| 934 | NC | Cobham Aviation Services Australia | ICAO: NJS, Name changed from National Jet Systems Pty. Ltd. t/a Cobham Aviation Services Australia - Airline Services w.e.f. 13 May 2009. Designator NC recalled by IATA | AUS | AVCODES |
| 935 | NC | Northern Air Cargo, LLC. | ICAO: NAC, Callsign: Yukon, IATA Prefix: 345, ICAO callsign changed from Northern Air Cargo. Name changed from Northern Air Cargo, Inc. | USA | AVCODES |
| 936 | NC | CSX Transportation, Inc. | added 7/1987; 1/1994-7/2005 | | NAKINA |
| 937 | NC | Seaboard System R.R., Inc. | added 1/1983; eliminated 7/1987 | | NAKINA |
| 938 | NC | Louisville and Nashville R.R. Co. | eliminated 1/1983 | | NAKINA |
| 939 | NC | Louisville and Nashville R.R. Co. (Nashville, Chattanooga & St. Louis) | 1/1975-1/1980 | | NAKINA |
| 940 | NC | Nashville Chattanooga & St. Louis Ry. | 7/1965 | | NAKINA |
| 941 | NC | Nashville Chattanooga & St. Louis Ry. | Jul-65 | | NRHS |
| 942 | NC | Louisville and Nashville R.R. Co. (Nashville, Chattanooga & St. Louis) | 1/75-1/80 | | NRHS |
| 943 | NC | Louisville and Nashville R.R. Co. | eliminated 1/83 | | NRHS |
| 944 | NC | Seaboard System R.R., Inc. | added 1/83; eliminated 7/87 | | NRHS |
| 945 | NC | CSX Transportation, Inc. | added 7/87; 1/94-7/2000 | | NRHS |
| 946 | NC | CSX [SEABOARD; NASHVILLE, CHATTANOOGA & ST. LOUIS RY] | | | PWRC |
| 947 | NC | Nashville and Chattanooga Railroad (CSX Transportation) | | | RSRV |
| 948 | NC | Nashville Chattanooga & St. Louis Ry. | | USA | TRAFFIC |
| 949 | NC | NordCargo S.r.l. | | IT | VKM |
| 950 | NC&S | Neame, Carson & Southern R.R. Co. | 7/1923 | | NAKINA |
| 951 | NC&S | NEAME, CARSON & SOUTHERN RAILROAD CO. | | | PWRC |
| 952 | NC&STL | NASHVILLE, CHATTANOOGA & ST. LOUIS | | | PWRC |
| 953 | NCA | Nippon Cargo Airlines | IATA: KZ, Callsign: Nippon Cargo, IATA Prefix: 933, IATA designator changed from MC | J | AVCODES |
| 954 | NCA | Nippon Cargo Airlines | IATA: NC, Callsign: Nippon Cargo, IATA designator changed to KZ | J | AVCODES |
| 955 | NCA | Nippon Cargo Airlines | IATA: KZ | | ICAO1 |
| 956 | NCA | Nippon Cargo Airlines | | J | TRAFFIC |
| 957 | NCAB | NC TRUCKING LLC | | | SCAC4 |
| 958 | NCAC | NORGREN, C A CO/DETROIT DIVISION | | | SCAC3 |
| 959 | NCAG | NEWMAN CARTAGE INC | | | SCAC3 |
| 960 | NCAG | NORTH 49 TRUCKLINES INC | | | SCAC4 |
| 961 | NCAI | NCA TRANSPORT INC | | | SCAC4 |
| 962 | NCAL | NORWEGIAN CARIBBEAN LINES | | | PWRC |
| 963 | NCAL | NOR-CAL MOVING SERVICES | | | SCAC4 |
| 964 | NCAN | Incan Superior Ltd. | 1/1975-1/1980 | | NAKINA |
| 965 | NCAN | Incan Superior Ltd. | 1/75-1/80 | | NRHS |
| 966 | NCAN | RETIRED 11-24-92 ATP (0356) [INCAN SUPERIOR LTD.] | | | PWRC |
| 967 | NCAN | Incan Superior | | | RSRV |
| 968 | NCAO | NOVAJO CARRIERS | | | SCAC4 |
| 969 | NCAQ | NCA TRUCKING | | | SCAC3 |
| 970 | NCAQ | NATIONAL OIL & BURNER COMPANY | | | SCAC4 |
| 971 | NCAR | Nuevo Central Argentina | Real: NCA | RA | TRAFFIC |
| 972 | NCAS | NEW CASTLE TRAVEL SERVICE | | | SCAC3 |
| 973 | NCAS | NORTHERN CASCADE DOOR & | | | SCAC4 |
| 974 | NCAT | NACA TRUCKING CO | | | SCAC3 |
| 975 | NCAU | COLONIAL / ATL (BERMUDA) LTD. | | | PWRC |
| 976 | NCAU | COLONIAL/ATL (BERMUDA) LTD. | | | SCAC3 |
| 977 | NCAZ | NCA LEASING COMPANY/DIV. G.H. LEASING CORPORATION | | | PWRC |
| 978 | NCAZ | NCA Leasing | | | RSRV |
| 979 | NCAZ | NCA LEASING COMPANY/DIV G H LEASING | | | SCAC4 |
| 980 | NCB | North Caribou Flying Service Ltd. | Callsign: North Caribou, | CDN | AVCODES |
| 981 | NCB | North Caribou Flying Service Ltd | | | ICAO1 |
| 982 | NCB | Nevada Copper Belt Ry. | 4/1938 | | NAKINA |
| 983 | NCB | Nevada Copper Belt R.R. | 1/1941-1/1946 | | NAKINA |
| 984 | NCB | Nevada Copper Belt R.R. Co. | 7/1923-7/1936 | | NAKINA |
| 985 | NCB | Nevada Copper Belt Ry. | Apr-38 | | NRHS |
| 986 | NCB | NEVADA COPPER BELT RWY. | | | PWRC |
| 987 | NCB | Nevada Copper Belt Ry. | | USA | TRAFFIC |
| 988 | NCBB | NORTH CARIBBEAN SHIPPING CO. LTD. | | | SCAC3 |
| 989 | NCBC | N C B C BUS SERVICE | | | SCAC3 |
| 990 | NCBD | NOVO CARGO SERVICES LTD | | | SCAC3 |
| 991 | NCBL | NORELCO CABINETS 1989 LTD | | | SCAC4 |
| 992 | NCBP | NATIONAL CROSS BORDER XPRESS LLC | | | SCAC4 |
| 993 | NCBT | NATIVE COWBOY TRUCKING | | | SCAC4 |
| 994 | NCBU | NORTHBROOK CONTAINER LEASING | | | PWRC |
| 995 | NCBU | Northbrook Container Leasing | | | RSRV |
| 996 | NCBU | NORTHBROOK CONTAINER LEASING | | | SCAC3 |
| 997 | NCBU | NORTHBROOK CONTAINER LEASING | | | SCAC4 |
| 998 | NCBX | NEW CENTURY RAIL TRANSPOR LLC | | | SCAC4 |
| 999 | NCC | North Coast Air Services Ltd. | Callsign: North Coast, | CDN | AVCODES |
| 1000 | NCC | T3 Aviation, Inc. | Callsign: Starfleet, | USA | AVCODES |
